Headphones in Corporate Culture?

TheGreatOrangePeel asks: "In an ever increasing sea of white-earbuds in my office, I broke from the mainstream and recently purchased the iAudio X5 to help pass the downtime I experience behind cube walls. I've got a decent set of headphones, but recently I've discovered that being able to hear the rap-tap on the cube frame is sometimes a problem even with the volume cranked way down and considering how my current headphones are about ready for retirement anyway, I thought I would start shopping around for a new set. The problem is that most of mid priced headphones out there are designed to block out real world noise. The Sennheiser PX100 look like they may fit what I'm looking for, but I question the durability of folding headphones and I thought I would see what my peers on Slashdot prefer. What I'm looking for is a set of headphones with (1) good sound in a wide variety of music (2) in the $30-$99 range that (3) will let me hear the warnings of imminent attack at work by co-workers, and the alerts at my monthly LAN parties from allied gamers."